Supply roll cover arrangement for air filter apparatus



: ll-2'2 March 23, 1967 Jan. 23, E R V L 3,364,662

SUPPLY ROLL COVER ARRANGEMENT FOR AIR FILTER APPARATUS 2 Sheets-Sheet 1INVENTOR. A/an E. A

@ QQM Jan. 23, 1968 A. E REVELL 3,364,662

SUPPLY ROLL COVER ARRANGEMENT FOR AIR FILTER APPARATUS Filed March 2,1967 2 Sheets-Sheet 2 INVENTOR. A/an E Rerefl United States PatentOfifice 3,3%4,6fi2 Patented Jan. 23, 1968 3,364,662 SUPPLY ROLL COVERARRANGEMENT FOR AIR FELTER APPARATUS Alan E. Revcll, Louisville, Kyassignor to American Air Filter Company, Inc, Louisville, Ky., 21corporation of Delaware Filed Mar. 2, 1967, Ser. No. 620,022 6 Claims.(Cl. 55354) ABSTRACT {IF THE DISCLGSURE A supply roll housingarrangement for gas filter apparatus comprising a cover assemblyconformable to a filter medium roll to form a looped protecting shieldfor the roll, the cover assembly being contractable about the roll asthe roll is spent in filtering operations.

Background of the invention The present invention relates to gas filterapparatus of the type wherein filter medium in roll form is advancedfrom a supply section through a gas treating section into a take-upsection.

Various types of supply section arrangements for such filter apparatusare known in the art. In many of these arrangements the supply sectionconsists merely of a pair of spaced cantilevered arm members extendingin horizontal fashion at right angles from the upper portion of the rollhousing, the arms having bearing means at their free ends to support asupply roll of filter medium along the dirty gas stream side of thefilter apparatus. The surface of the roll so supported is exposed to thegas stream being treated and as filter medium is fed into the treatedgas stream that portion of the exposed roll surface is passed to theclean gas treating side of the filter apparatus. To avoid thisundesirable consequence, various types of box-like supply sections havebeen utilized to protect the roll surface in the supply section. For themost part, these past arrangements have been complex and expensive inconstruction and maintenance, have been cumbersome in operation andstorage, and have occupied the same volume of space throughout gastreating operations.

Summary The present invention provides a novel supply roll coverarrangement for gas filter apparatus which avoids many of theaforementioned disadvantages of past arrangements, which is economicaland straightforward in construction, operation and maintenance, whichcan be readily packaged for storage and shipment and which occupies areduced volume of space as filtering operations progress.

Various other features of the present invention will become obvious toone skilled in the art upon reading the disclosure set forthhereinafter.

More particularly, the present invention provides, in a gas filterapparatus including a housing having a supply section at one end thereoffor storing a web of elongated filter medium mounted in roll formbetween opposed end plates of a spindle which is supported in cantileverfashion from the housing, a take-up section at the opposite end of thehousing to take up spent filter medium, and a gas treating fiow throughsection intermediate the supply and take-up sections, an improved supplysection arrangement comprising: a supply roll cover means includingfirst and second portions of preselected breadth and width connectablealong adjacent edges in end-toend alignment, the cover portions whenconnected being conformable to the filter medium roll between the endplates of the spindle to form a looped protective shield for the filtermedium roll to shield the roll from the gas stream passing through thefilter section, means to mount the cover portions at their edgesopposite the connectable edges to positions adjacent the housing; and,means to contract the shield formed by the cover portions about thefilter medium roll as the roll is spent.

t is to be understood that various changes can be made in thearrangement, form and construction of the apparatus disclosed herein byone skilled in the art without departing from the scope or spirit of thepresent invention.

Referring to the drawings which disclose one advantageous embodiment ofthe present invention and several novel modifications thereto:

FIGURE 1 is a side elevational view of a gas filter apparatusincorporating the novel supply section arrangement of the presentinvention;

FIGURE 2 is a front elevational View of the apparatus of FIGURE 1;

FIGURE 3 is an enlarged isometric view of a portion of the apparatus ofFIGURE 1, disclosing details of the novel supply section arrangement inoperatively closed position;

FIGURE 4 is a view similar to FIGURE 3 disclosing details of the novelsupply section arrangement in open position;

FIGURE 5 is an enlarged isometric view similar to that of FIGURES 3 and4 disclosing a modification t0 the present invention;

FIGURE 6 is an enlarged isometric view similar to FIGURES 3 and 4disclosing another modification to the present invention;

FIGURE 7 is an enlarged isometric view similar to that of FIGURES 3 and4 disclosing still another modification to the present invention; and,

FIGURE 8 is a reduced side view of the apparatus of FIGURE 7, disclosingthe apparatus with both cover members in operatively closed position.

Referring to FIGURES 1 and 2 of the drawings, a roll type filter housing2 is disclosed in vertical position. Housing 2, which can be made of asuitable guage sheet metal, includes top filter medium supply section 3located at one end of the housing, a take-up section 4 located at theopposite end of the housing and a gas treating flowthrough section 6disposed intermediate supply section 3 and take-up section 4. Mounted inwound form in supply section 3 is a Web of elongated filter medium inthe form of supply roll 7. Roll 7 can be comprised of a web of any oneof a number of known suitable filter medium materials. For example, asuitable glass fiber filter material of interconnected and bonded glassfibers can be used. In the embodiment disclosed web 7 is supported insupply section 3 by means of a pair of arms 3 which extend at rightangles in cantilevered fashion from housing 2, and which are providedwith suitable bearing mounts (not shown) in a manner known in the art.

In operation, Web 7 is advanced by suitable drive and control means (notshown in detail) incrementally from time to time over roller 5 into andthrough gas treating section 6 through which a gas stream to be treatedmust flow. Web '7 is then correspondingly progressively advanced totake-up zone 4 where it is passed around idle roller 9 and wound uponrewind spools 11 into a roll 12 which can be ultimately thrown away orreconditioned for further use.

In accordance with the present invention and as can be seen more readilyin FIGURES 3 and 4, pivotally mounted to the frame of housing 2 intake-up section 3 is top cover portion 13. As shown in FIGURES 3 and 4,cover portion 13, which can be formed from a suitable thin gaugesubstantially rigid sheet of metal material, is of preselected breadthand width so as to rest in covering relationship on the top portion ofroll '7 between end plates 1%} of the roil spindle. As can be seenclearly in FIGURE 4, cover portion 13 is provided at its edge oppositethat edge pivotally mounted to housing 2 with an outturned lip Lip 14which forms the connectable edge of cover portion 13 is adapted toengage in interlocking relationship with lip 16 of the connectable edgeof cover portion 17. Cover portion 17 also is of preselected breadth andwidth to rest between end plates 16 in covering relationship with thelower portion of roll 7, the cover portions 13 and 17 when connected inend-to-end alignment through interlocked lips 14 and 16 serving to forma protective shield for roll 7. It is to be noted that cover por tion17, which can be made from similar substantially rigid thin gauge metalmaterial as cover portion 13, is of curved contour to conform to thecontour of roll surface 7. It is to be understood that if desired, bothcover portions 13 and 17 can be of curved contour or cover portion 17can be flat and cover portion 13 arranged to include a curved section.It further is to be understood that cover portions 13 and 17 can beintegral to form an integral looped sheet.

As can be seen in FIGURES 3 and 4 of the drawings, cover portion 17 issupported at its edge 18 opposite its connectable edge, which includeslip 16, by means of spaced coil springs 19. The coil springs 19 arepositioned at opposite extremities of the edge 18, each having one endfastened to edge 18 and the other to cover portion 13 adjacent housing2. The springs 19 not only serve to support edge 18 of cover portion 17but also serve to contract the protective shield formed by the coverportions about the filter media roll 7 as roll 7 is spent duringfiltering operations.

Referring to FIGURE 5, a modified embodiment of the present invention isdisclosed wherein instead of rigid cover portion 17 there is provided acover portion comprising a resilient sheet of flexible plastic material22. Sheet 22, which can be formed from any one of a number of knownplastic-type materials, has the property of being settable in roll formand resiliently yieldable as it is developed in open sheet form. Suchplastic type materials are commonly seen in food stores as separatorsfor beverage cartons. Roll sheet cover portion 22, which is of similarpreselected breadth and width when in developed form as cover portion 17for which it substitutes, has one end fixedly mounted to rigid coverportion 13 adjacent housing 2 and the opposite free connectable end setto include a lip 23 adapted to engage in interlocking relationship withlip 14 of cover portion 13 When the rolled sheet is in developed openform. When the cover portions 22 and 13 are so interlocked in end-to-endalignment, a contractable protective shield is provided about filtermedium roll 7 as the roll 7 is spent.

Referring to FIGURE 6 of the drawings still another modified embodimentof the present invention is disclosed wherein, instead of rigid coverportion 17 or plastic roll sheet cover portion 22, there is providedflexible cover portion sheet 24 of predetermined length and breadthcomparable to cover portions 17 and 22 but mounted on spring loadedmandrel 26 which, in turn, is fastened to cover portion 13 at a positionadjacent the frame of housing 2. Spring loaded mandrel 26, which can belike those used for supporting household window shades and therefore notshown in detail, serves to contract cover portion 24 when lip 27 of thecover portion is placed in interlocked engagement with lip 14 of coverportion 13 so as to provide a protective contractable shield about thefilter media roll 7 as roll 7 is spent during filtering operations. Itwill be understood that the setting of the spring loaded mandrel 26 canbe adjusted to permit this and also can be adjusted to permit a completegathering of cover portion 24- into roll form when interlocked lips 27and 14 are disengaged.

Referring to FIGURES 7 and 8 of the drawings, still another embodimentof applicants invention is disclosed wherein a flexible sheet ofmaterial serves as cover portion 29. The material utilized can be anyone of a number of suitable protective cloths, cover portion 29 beingsus pended at one edge 31 to rigid cover portion 13 at a positionadjacent the frame of housing 2. The opposite edge of flexible coverportion 29 is provided with lip 32 which is adapted to engage with lip14 of rigid cover portion 13 (FIGURE 8). As also can be seen in FIG- URE8, cover portion 29 is of preselected breadth to fit between spindles 16of roll "7 and is of preselected length to provide a tuck 33. The tuck33 is insertable between rigid cover portion 13 and the top of filtermedium roll 7 so that the cover portion 29 is in snug engagement withthe body of roll '7. Accordingly, as the roll of filter material 7 isspent the tuck 33 of cover portion 29 is advanced inwardly as a resultof the friction between the roll and cover portion 29. Thus, acontractable protective shield is provided around roll 7.

It is to be understood that cover portion 29 is of a suitablepreselected adhesive quality so as to provide the necessary frictionbetween roll 7 and the filter material so that tuck 33 is advancedinwardly as roll 7 is spent.

The invention claimed is:

1. A gas filter apparatus including a housing having a supply section atone end thereof storing a web of elongated filter medium mounted in rollform between opposed end plates of a spindle that is supported incantilever fashion from said housing, a take-up section at the oppositeend or" said housing constructed and arranged to take up spent filtermedium, and a gas treating flow through section intermediate said supplyand take-up sections, an improved supply section arrangement comprising:

a supply roll protective cover means including first and second coverportions of preselected breadth and width connectable along thoseadjacent edges which extend substantially longitudinally of said roll inendto-end alignment, said cover portions when connected beingconformable to the filter medium roll between said end plates of saidspindles to form a looped shield for said filter medium roll to shieldsaid roll from a gas stream passing through said flow through section;means to mount said cover portions at the edges opposite saidconnectable edges at positions adjacent said housing; and means tocontract the shield formed by said cover portions about said filtermedium roll as said roll is spent.

2. The apparatus of claim 1, said first and second cover portions beingintegral at said connectable ends to form an integral looped sheet.

3. The apparatus of claim 1, said cover portions com prisingsubstantially rigid sheets of material with said adjacent edges havinginturned and out-turned lip portions adapted to engage in interlockingrelationship; said contracting means comprising coil springs fastened attheir ends at positions adjacent said housing and at opposite ends to anedge of one of said cover portions.

4. The apparatus of claim 1, one of said cover portions comprising aflexible sheet of material and the other a substantially rigid sheet ofmaterial; said contracting means comprising a tuck portion in saidflexible cover portion insertable between said rigid cover portion andsaid filter medium roll to be gathered inwardly as said roll is spent.

5. The apparatus of claim 1, one of said cover portions comprising aflexible sheet of material and the other a substantially rigid sheet ofmaterial said contracting means comprising a spring loaded mandrelrotatably mounted on said rigid cover portion adjacent said housing, theedge of said flexible cover portion opposite to its connectable edgebeing fixed to said spring loaded mandrel for retraction.

6. The apparatus of claim 1, one of said cover portions comprising aresilient sheet of flexible plastic material and the other asubstantially rigid sheet of material, said 5 cover portion of plasticmaterial being set in roll form and mounted on said rigid cover portionadjacent said housing so as to be resiliently yieldable as it isdeveloped in sheet form for connection at its connectable end to theconnectable end of said rigid cover portion.

References Cited UNITED STATES PATENTS 976,202 11/1910 Moore 210-3872,106,187 1/ 1938 Naugler. 2,521,455 9/ 1950 Gorgun.

Crane 210387X Callan et a1 55354 X Ruch. Gregory et al 55352 X Anderson210387 Palrnore 55354X Aitkenhead 55352X Levitas 55351 X Revell 55354HARRY B. THORNTON, Primary Examiner.

D. TALBERT, Assistant Examiner.

